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Remove use of memcpy in sim.c

--- a/sim.c

+++ b/sim.c

@@ -2,6 +2,16 @@

 #include "mark.h"

 #include "sim.h"

+#if 0

+ORCA_FORCE_STATIC_INLINE void stupid_memcpy(char* restrict dest,

+                                            char* restrict src, size_t sz) {

+  for (size_t i = 0; i < sz; ++i) {

+    dest[i] = src[i];

+  }

+}

+#define ORCA_MEMCPY(_dest, _src, _sz) memcpy(_dest, _src, _sz)

+#endif

+

 //////// Utilities

 static Glyph const indexed_glyphs[] = {

@@ -508,9 +518,15 @@

     Glyph buff[15];

     Glyph* gs = gbuffer + y * width + x + 1;

     Glyph hopped = *gs;

-    memcpy(buff, gs + 1, len - 1);

+    // ORCA_MEMCPY(buff, gs + 1, len - 1);

+    for (Usz i = 0; i < len - 1; ++i) {

+      buff[i] = gs[i + 1];

+    }

     buff[len - 1] = hopped;

-    memcpy(gs, buff, len);

+    // ORCA_MEMCPY(gs, buff, len);

+    for (Usz i = 0; i < len; ++i) {

+      gs[i] = buff[i];

+    }

     for (Usz i = 0; i < len; ++i) {

       STUN(0, (Isz)i + 1);

     }